"The temperature we see in Denver would be unrecognizable by the end of the century. More similar to historical temperatures like in Phoenix, Arizona," Sanderson said.

Trump said he made his decision to protect jobs and to get out of a deal that's unfair to the United States.

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"We will be environmentally friendly, but we're not [going to] put our businesses out of work and we're not [going to] lose our jobs," Trump said. "We're going to grow."

"We were going to take steps -- front loading our costs -- while the rest of the world waited to reduce their CO2 footprint," said EPA administrator Scott Pruitt said. "That's the reason it put us at an economic disadvantage internationally."

It will also be up to the other countries to determine the future of this deal.

Sanderson says other countries could step up and shoulder more of the responsibility with this agreement or the opposite.

While developing more clean energy could generate jobs, it could also mean losing current energy jobs.

One thing that did happen is it started a conversation about the environment not only in the U.S., but around the world.